EP0142778A2 - Nuclear reactor fuel element - Google Patents

Nuclear reactor fuel element Download PDF

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Publication number
EP0142778A2
EP0142778A2 EP84113451A EP84113451A EP0142778A2 EP 0142778 A2 EP0142778 A2 EP 0142778A2 EP 84113451 A EP84113451 A EP 84113451A EP 84113451 A EP84113451 A EP 84113451A EP 0142778 A2 EP0142778 A2 EP 0142778A2
Authority
EP
European Patent Office
Prior art keywords
bolt
fuel
box
corner
head
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP84113451A
Other languages
German (de)
French (fr)
Other versions
EP0142778B1 (en
EP0142778A3 (en
Inventor
Hans-Joachim Lippert
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Kraftwerk Union AG
Siemens AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kraftwerk Union AG, Siemens AG filed Critical Kraftwerk Union AG
Priority to AT84113451T priority Critical patent/ATE30281T1/en
Publication of EP0142778A2 publication Critical patent/EP0142778A2/en
Publication of EP0142778A3 publication Critical patent/EP0142778A3/xx
Application granted granted Critical
Publication of EP0142778B1 publication Critical patent/EP0142778B1/en
Expired legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C3/00—Reactor fuel elements and their assemblies; Selection of substances for use as reactor fuel elements
    • G21C3/30—Assemblies of a number of fuel elements in the form of a rigid unit
    • G21C3/32—Bundles of parallel pin-, rod-, or tube-shaped fuel elements
    • G21C3/33—Supporting or hanging of elements in the bundle; Means forming part of the bundle for inserting it into, or removing it from, the core; Means for coupling adjacent bundles
    • G21C3/3315—Upper nozzle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B41/00—Measures against loss of bolts, nuts, or pins; Measures against unauthorised operation of bolts, nuts or pins
    • F16B41/002—Measures against loss of bolts, nuts or pins
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C3/00—Reactor fuel elements and their assemblies; Selection of substances for use as reactor fuel elements
    • G21C3/30—Assemblies of a number of fuel elements in the form of a rigid unit
    • G21C3/32—Bundles of parallel pin-, rod-, or tube-shaped fuel elements
    • G21C3/33—Supporting or hanging of elements in the bundle; Means forming part of the bundle for inserting it into, or removing it from, the core; Means for coupling adjacent bundles
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00—Energy generation of nuclear origin
    • Y02E30/30—Nuclear fission reactors

Definitions

  • the invention relates to a nuclear reactor fuel element with fuel rods, which contain nuclear fuel, which are guided in bushings in a head plate and at least some of which is fastened in these bushings, and with a fuel assembly, in which the fuel rods are arranged, with one inside in one Corner at its upper end of the crosspiece rests on a corner bolt standing on the top of the head plate and, together with an angle part adapted to the fuel assembly box, which is provided on the outside on two sides of the fuel assembly box with a leaf spring extending in the box longitudinal direction, on this corner pin with one Expansion shaft with a reduced diameter screw bolt is screwed, which is captively assigned to the angle part by means of a bolt head on the upper side of the angle part and a holding body.
  • Such a nuclear reactor fuel element is known from German Offenlegungsschrift 28 24 265.
  • the holding body is located on the underside of the angular part of this known nuclear reactor fuel element and is a cylindrical pin arranged in a transverse bore of the screw bolt, which is secured against falling out of the transverse bore by a welding point on the screw bolt.
  • the cross-section of the bolt is reduced at the location of the cross hole. Furthermore, the material of the bolt is sensitive due to the welding point lized. Therefore, it may happen that the bolt does not tear on the expansion shaft provided for this purpose with a reduced diameter, but on the transverse bore, for example when longitudinal forces act on the bolt when the nuclear reactor fuel element is inserted into a boiling-water nuclear reactor.
  • the invention has for its object to further develop the known nuclear reactor fuel element and to ensure that the bolt always tears on the expansion shaft provided for this purpose with a reduced diameter and nowhere else if the expansion forces are too great.
  • a nuclear reactor fuel element of the type mentioned at the outset is characterized according to the invention in that the bolt head has a narrowing point which is formed by a coaxial bolt head shank with a reduced diameter and which is located in a bore in the angular part between the two ends of the bolt head, and that the holding body is a cross pin which grips between the two ends of the bolt head in its constriction point and is fastened in this bore on the angle part.
  • the angle part 2 has two mutually perpendicular, equally long legs 3 and 4.
  • the legs 3 and 4 On the same side of these legs 3 and 4 are walls 5 and 6, which are in a crown web 40 of the legs 3 and 4 to each other and to the crown web 40 at right angles.
  • the walls 5 and 6 form in the apex web 40 an elongated L-profile 7 which is perpendicular to the legs 3 and 4, while at the ends of the legs 3 and 4 they are formed into a rigid system boss 8 which rises outwards.
  • an elongated leaf spring 9 is arranged on both walls 5 and 6 in the direction of the L-profile 7 and each with one end a screw 10 rigidly attached to the angle part 2 at the upper end of the L-shaped profile 7.
  • the other end of the leaf spring 9 is guided freely sliding in a link 12 on the outside of the L-profile 7 at its lower end.
  • the leaf springs 9 are bent in three transverse lines 11 so that these leaf springs 9 bulge outwards from the outside of the L-profile 7.
  • a bolt 14 is displaceable and rotatable about its longitudinal axis and which has a smaller diameter on the underside of the angular part 2 than on the top and thereby forms a shoulder 16.
  • this screw bolt 14 has a bolt head 15 which has a larger diameter than the bore 13 on the shoulder 16 and to which the shoulder 16 in the passage 13 is assigned for support.
  • a spring ring 18 resilient in the longitudinal direction of the screw bolt 14, for which a depression 22 is provided in the shoulder 16.
  • the screw bolt 14 itself is provided at the other end on the underside of the angle part 2 with a thread 21. Between the thread 21 and the bolt head 15 there is an expansion shaft 23 with a reduced diameter.
  • the thread 21 of the screw bolt 14 can be screwed with a corner bolt on the upper side of the head plate of the nuclear reactor fuel element according to FIG. 3.
  • the bolt head 15 further has between its two ends a constriction 41, which is formed by a coaxial bolt head shank 42 with a reduced diameter and which is located in the bushing 13 in the angular part 2 on the upper side thereof.
  • a constriction 41 which is formed by a coaxial bolt head shank 42 with a reduced diameter and which is located in the bushing 13 in the angular part 2 on the upper side thereof.
  • two mutually parallel cross pins 43 are guided and fastened at a distance from one another, which also run transversely through the bore 13 at the top of the angular part 2 and are located in a common plane which is perpendicular to the longitudinal axis of the screw bolt 14.
  • the bolt head shank 42 is located between the two cross pins 43, on the other hand, these cross pins 43 are located between the two ends of the bolt head 15 at its constriction point 41.
  • the screw bolt 14 prevent the bolt head 15 from the bore 13 in the direction its longitudinal axis can slide out towards the top of the angle part 2 by forming a stop for the end of the bolt head 15 with the screw bolt 14 on the underside of the angle part 2.
  • the bolt head shank 42 is also made so long that the two cross pins 43 allow the bolt head 15 enough play so that it can lie tightly against the shoulder 16 when the spring ring 18 is pressed in if the other end of the bolt head 15 has a larger diameter than the bolt head shaft 42 has.
  • the nuclear reactor fuel element for a boiling water nuclear reactor has an elongated square fuel assembly box 30, which is provided with a crossbar 31 on the inside at its upper end in a corner is.
  • this fuel assembly 30 there are fuel rods 32 and 33 filled with nuclear fuel to the longitudinal direction device of the fuel assembly 30 parallel longitudinal axes arranged side by side.
  • the upper ends of the fuel rods 32, which are adjacent to the inside of the fuel assembly box 30, are guided through bushings 34 in a head plate 35 inside the fuel assembly box 30 and screwed into these bushings 34.
  • the upper ends of other fuel rods 33 filled with nuclear fuel are only loosely guided in bushings in the top plate 35.
  • All fuel rods 32 and 33 are supported against the head plate 35 with coil springs 36.
  • the lower ends of the fuel rods 32 and 33 are guided in feedthroughs in a footplate (not shown in FIG. 3) within the fuel assembly box 30 and, in the case of the fuel rods 32, are also screwed tight.
  • a corner bolt 37 in a corner of the fuel assembly box 30 with a longitudinal axis parallel to the longitudinal direction of the fuel assembly box 30 and the longitudinal axes of the fuel rods 32 and 33.
  • the transverse web 31 On the upper end of this corner bolt 37 there is the transverse web 31, which is located on the inside in a corner of the fuel assembly box 30. Outside on this crosspiece 31, the apex of the angle part 2 rests so that the fuel assembly box 30 is fitted with its edge between the walls 5 and 6 of the angle part 2 and in particular in the L-profile 7 without play.
  • the bolt 14 engages through a passage in the crosspiece 31 and is screwed to the threaded part 22 in a threaded hole in the corner bolt 37.
  • a bow handle 38 for the gripper of a fuel assembly loading machine is also arranged on the top of the head plate 35.
  • the fuel assembly boxes of the four nuclear reactor fuel elements located in the same mesh of the core lattice form a gap-shaped space with a cross-shaped cross section, into which an elongated control rod with a cross shape also is inserted from the lower ends of these four nuclear reactor fuel elements.

Abstract

A nuclear reactor fuel assembly having fuel rods containing nuclear fuel, includes a fuel assembly box in which the fuel rods are disposed, a head plate in the box having feedthroughs formed therein in which fuel rods are guided, at least some of the fuel rods being fastened to the head plate in the feedthroughs, a corner bolt disposed on top of the head plate, a cross piece disposed on the corner bolt at an upper inside corner of the box, an angular part disposed on two outer surfaces of the box, two leaf springs each extended in longitudinal direction of the box on a respective one of the two outer surfaces, a screw bolt connecting the box and the angular part to the corner bolt, the screw bolt having an expansion shank formed therein with a reduced diameter at the corner bolt, the screw bolt having a screw head with two ends, the screw head having a constriction formed therein between the ends thereof defining a coaxial screw head shank with a reduced diameter disposed in a hole formed in the angular part, and a holding body in the form of a transverse pin fastened to the angular part in the hole and engaging the screw bolt at the constriction for connecting the screw bolt to the top of the angular part.

Description

Die Erfindung betrifft ein Kernreaktorbrennelement mit Brennstäben, die Kernbrennstoff enthalten, die in Durchführungen in einer Kopfplatte geführt sind und von denen zumindest ein Teil in diesen Durchführungen befestigt ist, sowie mit einem Brennelementkasten, in dem die Brennstäbe angeordnet sind, der mit einem innen in einer Ecke an seinem Oberende befindlichen Quersteg auf einem auf der Oberseite der Kopfplatte stehenden Eckbolzen aufliegt und der zusammen mit einem dem Brennelementkasten angepaßten Winkelteil, das außen an zwei Seiten des Brennelementkastens je mit einer sich in Kastenlängsrichtung erstreckenden Blattfeder versehen ist, an diesem Eckbolzen mit einem einen Dehnungsschaft mit verringertem Durchmesser aufweisenden Schraubbolzen festgeschraubt ist, der mittels eines Bolzenkopfes an der Oberseite des Winkelteiles und eines Haltekörpers unverlierbar dem Winkelteil zugeordnet ist.The invention relates to a nuclear reactor fuel element with fuel rods, which contain nuclear fuel, which are guided in bushings in a head plate and at least some of which is fastened in these bushings, and with a fuel assembly, in which the fuel rods are arranged, with one inside in one Corner at its upper end of the crosspiece rests on a corner bolt standing on the top of the head plate and, together with an angle part adapted to the fuel assembly box, which is provided on the outside on two sides of the fuel assembly box with a leaf spring extending in the box longitudinal direction, on this corner pin with one Expansion shaft with a reduced diameter screw bolt is screwed, which is captively assigned to the angle part by means of a bolt head on the upper side of the angle part and a holding body.

Ein derartiges Kernreaktorbrennelement ist aus der deutschen Offenlegungsschrift 28 24 265 bekannt. Der Haltekörper befindet sich an der Unterseite des Winkelteiles dieses bekannten Kernreaktorbrennelementes und ist ein in einer Querbohrung des Schraubbolzens angeordneter Zylinderstift, der mit einem Schweißpunkt am Schraubbolzen gegen Herausfallen aus der Querbohrung gesichert ist.Such a nuclear reactor fuel element is known from German Offenlegungsschrift 28 24 265. The holding body is located on the underside of the angular part of this known nuclear reactor fuel element and is a cylindrical pin arranged in a transverse bore of the screw bolt, which is secured against falling out of the transverse bore by a welding point on the screw bolt.

An der Stelle der Querbohrung ist der Querschnitt des Schraubbolzens reduziert. Ferner ist dort durch den Schweißpunkt der Werkstoff des Schraubbolzens sensibilisiert. Deshalb kann es vorkommen, daß der Schraubbolzen nicht an dem dafür vorgesehenen Dehnungsschaft mit verringertem Durchmesser, sondern an der Querbohrung reißt, wenn beispielsweise beim Einsetzen des Kernreaktorbrennelementes in einen Siedewasserkernreaktor Dehnungskräfte in Längsrichtung auf den Schraubbolzen einwirken.The cross-section of the bolt is reduced at the location of the cross hole. Furthermore, the material of the bolt is sensitive due to the welding point lized. Therefore, it may happen that the bolt does not tear on the expansion shaft provided for this purpose with a reduced diameter, but on the transverse bore, for example when longitudinal forces act on the bolt when the nuclear reactor fuel element is inserted into a boiling-water nuclear reactor.

Der Erfindung liegt die Aufgabe zugrunde, das bekannte Kernreaktorbrennelement weiterzubilden und zu gewährleisten, daß der Schraubbolzen bei zu großen Dehnungskräften stets am dafür vorgesehenen Dehnungsschaft mit verringertem Durchmesser und nirgendwo anders reißt.The invention has for its object to further develop the known nuclear reactor fuel element and to ensure that the bolt always tears on the expansion shaft provided for this purpose with a reduced diameter and nowhere else if the expansion forces are too great.

Zur Lösung dieser Aufgabe ist ein Kernreaktorbrennelement der eingangs erwähnten Art erfindungsgemäß'dadurch gekennzeichnet, daß der Bolzenkopf eine Verengungsstelle aufweist, die durch einen koaxialen Bolzenkopfschaft mit verringertem Durchmesser gebildet ist und die sich in einer Bohrung im Winkelteil zwischen den beiden Enden des Bolzenkopfes befindet, und daß der Haltekörper ein zwischen die beiden Enden des Bolzenkopfes in dessen Verengungsstelle greifender Querstift ist, der in dieser Bohrung am Winkelteil befestigt ist.To achieve this object, a nuclear reactor fuel element of the type mentioned at the outset is characterized according to the invention in that the bolt head has a narrowing point which is formed by a coaxial bolt head shank with a reduced diameter and which is located in a bore in the angular part between the two ends of the bolt head, and that the holding body is a cross pin which grips between the two ends of the bolt head in its constriction point and is fastened in this bore on the angle part.

Auf diese Weise ist sichergestellt, daß der Schraubbolzen nur am Dehnungsschaft reißt, wenn die Dehnungskräfte im Schraubbolzen zu groß werden, während die Verengungsstelle des Bolzenkopfes, d.h. der Bolzenkopf- schaft mit verringertem Durchmesser von diesen Dehnungskräften überhaupt nicht beansprucht wird. Der Querstift verhindert so, daß sich die Bruchteile des Schraubbolzens beim Reißen des Dehungsschaftes vom Kernreaktor- brennelement lösen können.In this way it is ensured that the bolt tears only on the expansion shaft if the expansion forces in the bolt become too great while the constriction point of the bolt head, i.e. the bolt head shank with reduced diameter is not at all stressed by these expansion forces. The cross pin thus prevents the fragments of the bolt from being able to come loose from the nuclear reactor fuel element when the expansion shaft is torn.

Dadurch können sich entweder beim Reißen des Dehnungsschaftes der Schraubbolzen noch bei Bruch des Federringes Bruchteile des letzteren vom Kernreaktorbrennelement lösen. Trotzdem ist aber der Schraubbolzen um seine Längsachse drehbar.As a result, fractions of the latter can become detached from the nuclear reactor fuel element either when the expansion shaft tears or the spring ring breaks. Nevertheless, the screw bolt is rotatable about its longitudinal axis.

Aus der deutschen Offenlegungsschrift 24 30 642 ist ein Gehäusesockel eines Elektrizitätszählers mit einem Gehäusedeckel bekannt, der mit einem Schraubbolzen mit dem Gehäusesockel verschraubt ist. Dieser Schraubbolzen weist zwar eine Schwächungsstelle, an der der Schraubbolzen bei mechanischen Spannungen brechen soll, und getrennt von dieser Schwächungsstelle eine Kerbe auf, in welche eine am Gehäusedeckel abgestützte Haltescheibe greift, diese Kerbe befindet sich jedoch nicht zwischen den beider Enden des Bolzenkopfes, dessen Unterende notwendigerweise durch seine AbstUtzstelle am Gehänsedeckel bestimmt ist, sondern genauso wie die Schwächungsstelle im am Unterende des Bolzenkopfes ausgebildeten Schaft des Schraubbolzens. Mechanische Spannungen können daher auch dazu führen, daß dieser Schaft nicht an der dafür vorgesehenen Schwächungsstelle reißt, sondern an der Kerbe, so daß der Bolzenkopf und die Haltescheibe nicht mehr gegen Herausfallen aus dem Gehäusedeckel gesichert sind.From the German published patent application 24 30 642 a housing base of an electricity meter with a housing cover is known, which is screwed to the housing base with a screw bolt. Although this bolt has a weakening point at which the bolt is to break under mechanical stresses, and separate from this weakening point a notch into which a retaining washer supported on the housing cover engages, this notch is however not between the two ends of the bolt head, the lower end of which is necessarily determined by its support point on the hanger cover, but just like the weakening point in the shaft of the screw bolt formed at the lower end of the bolt head. Mechanical stresses can therefore also cause this shaft not to tear at the intended weakening point, but rather at the notch, so that the bolt head and the retaining washer are no longer secured against falling out of the housing cover.

Die Erfindung und ihre Vorteile seien anhand der Zeichnung an einem Ausführungsbeispiel näher erläutert:

  • Fig. 1 zeigt einen Längsschnitt eines Winkelteiles für ein erfindungsgemäßes Kernreaktorbrennelement entsprechend der strichpunktierten Linie I-I in Fig. 2.
  • Fig. 2 zeigt eine Draufsicht auf das Winkelteil nach Fig. 1.
  • Fig. 3 zeigt teilweise im Längsschnitt den oberen Teil eines erfindungsgemäßen Kernreaktorbrennelementes.
The invention and its advantages are explained in more detail with reference to the drawing using an exemplary embodiment:
  • FIG. 1 shows a longitudinal section of an angle part for a nuclear reactor fuel element according to the invention along the dash-dotted line II in FIG. 2.
  • FIG. 2 shows a top view of the angle part according to FIG. 1.
  • Fig. 3 shows partially in longitudinal section the upper part of a nuclear reactor fuel element according to the invention.

Wie die Fig. 1 und 2 zeigen, weist das Winkelteil 2 zwei zueinander rechtwinklige, gleich lange Schenkel 3 und 4 auf. An der gleichen Seite dieser Schenkel 3 und 4 befinden sich Wandungen 5 und 6, die in einem Scheitelsteg 40 der Schenkel 3 und 4 zueinander und zum Scheitelsteg 40 rechtwinklig sind. Die Wandungen 5 und 6 bilden im Scheitelsteg 40 ein zu den Schenkeln 3 und 4 rechtwinkliges langgestrecktes L-Profil 7, während sie an den Enden der Schenkel 3 und 4 zu einem starren, sich nach außen erhebenden Anlagenoppen 8 ausgeformt sind.1 and 2 show, the angle part 2 has two mutually perpendicular, equally long legs 3 and 4. On the same side of these legs 3 and 4 are walls 5 and 6, which are in a crown web 40 of the legs 3 and 4 to each other and to the crown web 40 at right angles. The walls 5 and 6 form in the apex web 40 an elongated L-profile 7 which is perpendicular to the legs 3 and 4, while at the ends of the legs 3 and 4 they are formed into a rigid system boss 8 which rises outwards.

Außen am L-förmigen Profil 7 ist auf beiden Wandungen 5 und 6 je eine langgestreckte Blattfeder 9 in Richtung des L-Profils 7 angeordnet und jeweils an einem Ende mit einer Schraube 10 am Winkelteil 2 am Oberende des L-förmigen Profils 7 starr befestigt. Das andere Ende der Blattfeder 9 ist jeweils frei gleitend in einer Kulisse 12 an der Außenseite des L-Profils 7 an dessen Unterende geführt. Die Blattfedern 9 sind in drei Querlinien 11 so geknickt, daß sich diese Blattfedern 9 nach außen von der Außenseite des L-Profils 7 wegwölben.On the outside of the L-shaped profile 7, an elongated leaf spring 9 is arranged on both walls 5 and 6 in the direction of the L-profile 7 and each with one end a screw 10 rigidly attached to the angle part 2 at the upper end of the L-shaped profile 7. The other end of the leaf spring 9 is guided freely sliding in a link 12 on the outside of the L-profile 7 at its lower end. The leaf springs 9 are bent in three transverse lines 11 so that these leaf springs 9 bulge outwards from the outside of the L-profile 7.

Im Scheitelsteg 40 der Schenkel 3 und 4 befindet sich ferner eine zu den beiden Schenkeln 3 und 4 rechtwinklige, d.h. zu den Wandungen 5 und 6 parallele durchgehende Bohrung 13, in der sich ein Schraubbolzen 14 verschiebbar und um seine Längsachse drehbar befindet und die an der Unterseite des Winkelteiles 2 einen kleineren Durchmesser als an der Oberseite hat und dadurch eine Schulter 16 ausbildet. An dem einen Ende an der Oberseite des Winkelteiles 2 weist dieser Schraubbolzen 14 einen Bolzenkopf 15 auf, der einen größeren Durchmesser als die Bohrung 13 an der Schulter 16 hat und dem die Schulter 16 in der Durchführung 13 zum Abstützen zugeordnet ist. Zwischen dem Bolzenkopf 15 und der Schulter 16 in der Bohrung 13 des Winkelteiles 2 befindet sich lose auf dem Schraubbolzen 14 noch ein in längsrichtung des Schraubbolzens 14 federnder Federring 18, für den in der Schulter 16 eine Aussenkung 22 vorgesehen ist.In the crown web 40 of the legs 3 and 4 there is also a right-angled to the two legs 3 and 4, i.e. to the walls 5 and 6 parallel through bore 13, in which a bolt 14 is displaceable and rotatable about its longitudinal axis and which has a smaller diameter on the underside of the angular part 2 than on the top and thereby forms a shoulder 16. At one end at the top of the angle part 2, this screw bolt 14 has a bolt head 15 which has a larger diameter than the bore 13 on the shoulder 16 and to which the shoulder 16 in the passage 13 is assigned for support. Between the bolt head 15 and the shoulder 16 in the bore 13 of the angled part 2 there is loosely on the screw bolt 14 a spring ring 18 resilient in the longitudinal direction of the screw bolt 14, for which a depression 22 is provided in the shoulder 16.

Der Schraubbolzen 14 selbst ist am anderen Ende an der Unterseite des Winkelteiles 2 mit einem Gewinde 21 versehen. Zwischen dem Gewinde 21 nd dem Bolzenkopf 15 befindet sich ein Dehnungsschaft 23 mit verringertem Durchmesser. Das Gewinde 21 des Schraubbolzens 14 kann mit einem Eckbolzen auf der Oberseite der Kopfplatte des Kernreaktorbrennelements nach Fig. 3 verschraubt werden.The screw bolt 14 itself is provided at the other end on the underside of the angle part 2 with a thread 21. Between the thread 21 and the bolt head 15 there is an expansion shaft 23 with a reduced diameter. The thread 21 of the screw bolt 14 can be screwed with a corner bolt on the upper side of the head plate of the nuclear reactor fuel element according to FIG. 3.

Der Bolzenkopf 15 weist ferner zwischen seinen beiden Enden eine Verengungsstelle 41 auf, die durch einen koaxialen Bolzenkopfschaft 42 mit verringertem Durchmesser gebildet ist und die sich in der Durchführung 13 im Winkelteil 2 an dessen Oberseite befindet. Im Winkelteil 2 sind zwei zueinander parallele Querstifte 43 mit Abstand voneinander geführt und befestigt, die auch quer durch die Bohrung 13 an der Oberseite des Winkelteiles 2 verlaufen und sich in einer gemeinsamen Ebene befinden, die rechtwinklig zur Längsachse des Schraubbolzens 14 ist. Einerseits befindet sich der Bolzenkopfschaft 42 zwischen den beiden Querstiften 43, andererseits befinden sich diese Querstifte 43 zwischen den beiden Enden des Bolzenkopfes 15 an dessen Verengungsstelle 41. Dort verhindern sie als Haltekörper für den Schraubbolzen 14, daß der Bolzenkopf 15 aus der Bohrung 13 in Richtung seiner Längsachse zur Oberseite des Winkelteiles 2 hin hinausgleiten kann, indem sie einen Anschlag für das Ende des Bolzenkopfes 15 mit dem Schraubbolzen 14 an der Unterseite des Winkelteiles 2 bilden. Der Bolzenkopfschaft 42 ist aber auch so lang ausgeführt, daß die beiden Querstifte 43 dem Bolzenkopf 15 genügend Spiel gewähren, so daß er bei eingedrücktem Federring 18 mit einem Ende satt an der Schulter 16 anliegen kann, wenn das andere Ende des Bolzenkopfes 15 größeren Durchmesser als der Bolzenkopfschaft 42 hat.The bolt head 15 further has between its two ends a constriction 41, which is formed by a coaxial bolt head shank 42 with a reduced diameter and which is located in the bushing 13 in the angular part 2 on the upper side thereof. In the angular part 2, two mutually parallel cross pins 43 are guided and fastened at a distance from one another, which also run transversely through the bore 13 at the top of the angular part 2 and are located in a common plane which is perpendicular to the longitudinal axis of the screw bolt 14. On the one hand, the bolt head shank 42 is located between the two cross pins 43, on the other hand, these cross pins 43 are located between the two ends of the bolt head 15 at its constriction point 41. There, as a holding body for the screw bolt 14, they prevent the bolt head 15 from the bore 13 in the direction its longitudinal axis can slide out towards the top of the angle part 2 by forming a stop for the end of the bolt head 15 with the screw bolt 14 on the underside of the angle part 2. The bolt head shank 42 is also made so long that the two cross pins 43 allow the bolt head 15 enough play so that it can lie tightly against the shoulder 16 when the spring ring 18 is pressed in if the other end of the bolt head 15 has a larger diameter than the bolt head shaft 42 has.

Wie Fig. 3 zeigt, in der gleiche Teile mit den gleichen Bezugszeichen wie in den Fig. und 2 versehen sind, weist das Kernreaktorbennelement für einen Siedewasserkernreaktor einen langgestreckten quadratischen Brennelementkasten 30 auf, der an seinem Oberende in einer Ecke innen mit einem Quersteg 31 versehen ist. Innerhalb dieses Brennelementkastens 30 sind mit Kernbrennstoff gefüllte Brennstäbe 32 und 33 mit zur Längsrichtung des Brennelementkastens 30 parallelen Längsachsen nebeneinander angeordnet. Die Oberenden der Brennstäbe 32, die benachbart zu der Innenseite des Brennelementkastens 30 sind, sind durch Durchführungen 34 in einer Kopfplatte 35 innerhalb des. Brennelementkastens 30 geführt und in diesen Durchführungen 34 verschraubt. Die Oberenden anderer mit Kernbrennstoff gefüllter Brennstäbe 33 sind nur lose in Durchführungen in der Kopfplatte 35 geführt. Alle Brennstäbe 32 und 33 sind gegen die Kopfplatte 35 mit Schraubenfedern 36 abgestützt. In gleicher Weise sind die Unterenden der Brennstäbe 32 und 33 in Durchführungen in einer in Fig. 3 nicht dargestellten Fußplatte innerhalb des Brennelementkastens 30 geführt und im Falle der Brennstäbe 32 auch festgeschraubt.As shown in FIG. 3, in which the same parts are provided with the same reference numerals as in FIGS. 2 and 2, the nuclear reactor fuel element for a boiling water nuclear reactor has an elongated square fuel assembly box 30, which is provided with a crossbar 31 on the inside at its upper end in a corner is. Within this fuel assembly 30 there are fuel rods 32 and 33 filled with nuclear fuel to the longitudinal direction device of the fuel assembly 30 parallel longitudinal axes arranged side by side. The upper ends of the fuel rods 32, which are adjacent to the inside of the fuel assembly box 30, are guided through bushings 34 in a head plate 35 inside the fuel assembly box 30 and screwed into these bushings 34. The upper ends of other fuel rods 33 filled with nuclear fuel are only loosely guided in bushings in the top plate 35. All fuel rods 32 and 33 are supported against the head plate 35 with coil springs 36. In the same way, the lower ends of the fuel rods 32 and 33 are guided in feedthroughs in a footplate (not shown in FIG. 3) within the fuel assembly box 30 and, in the case of the fuel rods 32, are also screwed tight.

Auf der Oberseite der Kopfplatte 35 steht in einer Ecke des Brennelementkastens 30 ein Eckbolzen 37 mit zur Längsrichtung des Brennelementkastens 30 und den Längsachsen der Brennstäbe 32 und 33 paralleler Längsachse Auf dem Oberende dieses Eckbolzens 37 liegt der Quersteg 31 auf, der sich innen in einer Ecke des Brennelementkastens 30 befindet. Außen auf diesem Quersteg 31 liegt der Scheitelsteg des Winkelteiles 2 so auf, daß der Brennelementkasten 30 mit seiner Kante zwischen den Wandungen 5 und 6 des Winkelteiles 2 und insbesondere im L-Profil 7 spielfrei eingepaßt ist.On the top of the head plate 35 there is a corner bolt 37 in a corner of the fuel assembly box 30 with a longitudinal axis parallel to the longitudinal direction of the fuel assembly box 30 and the longitudinal axes of the fuel rods 32 and 33. On the upper end of this corner bolt 37 there is the transverse web 31, which is located on the inside in a corner of the fuel assembly box 30. Outside on this crosspiece 31, the apex of the angle part 2 rests so that the fuel assembly box 30 is fitted with its edge between the walls 5 and 6 of the angle part 2 and in particular in the L-profile 7 without play.

Der Schraubbolzen 14 greift durch eine Durchführung im Quersteg 31 und ist mit dem Gewindeteil 22 in einer Gewindebohrung im Eckbolzen 37 festgeschraubt.The bolt 14 engages through a passage in the crosspiece 31 and is screwed to the threaded part 22 in a threaded hole in the corner bolt 37.

Auf der Oberseite der Kopfplatte 35 ist noch ein Bügelgriff 38 für den Greifer einer Brennelement-Lademaschine angeordnet.A bow handle 38 for the gripper of a fuel assembly loading machine is also arranged on the top of the head plate 35.

In einem Siedewasserkernreaktor werden, wie auch in den deutschen Offenlegungsschriften 28 24 265 und 30 27 562 beschrieben ist, jeweils vier Kernreaktorbrennelemente entsprechend Fig. 3 in einer quadratischen Gittermasche eines Quergitters, des sogenannten oberen Kerngitters, angeordnet. Jedes dieser vier Brennelemente befindet sich so in einer Ecke dieser Masche, daß sich die Ecken der Brennelementkästen 30 mit den Winkelteilen 2 im Zentrum der Masche befinden und sich dort jeweils zwei Blattfedern 9 seitlich benachbarter Kernreaktorbrennelemente gegeneinander abstützen. Die Brennelementkästen der vier in derselben Masche des Kerngitters befindlichen Kernreaktorbrennelemente bilden einen spaltförmigen Zwischenraum mit kreuzförmigem Querschnitt, in den ein langgestreckter Steuerstab mit ebenfalls kreuzförmigem Querschnitt von den Unterenden dieser vier Kernreaktorbrennelemente her eingeschoben wird.In a boiling water nuclear reactor, as is also described in German Offenlegungsschriften 28 24 265 and 30 27 562, four nuclear reactor fuel elements corresponding to FIG. 3 are each arranged in a square grid mesh of a transverse grid, the so-called upper core grid. Each of these four fuel assemblies is located in a corner of this mesh such that the corners of the fuel assembly boxes 30 with the angular parts 2 are in the center of the mesh and two leaf springs 9 of laterally adjacent nuclear reactor fuel assemblies are supported against each other there. The fuel assembly boxes of the four nuclear reactor fuel elements located in the same mesh of the core lattice form a gap-shaped space with a cross-shaped cross section, into which an elongated control rod with a cross shape also is inserted from the lower ends of these four nuclear reactor fuel elements.

Beim Be- und Entladen der vier Kernreaktorbrennelemente in die bzw. aus der Masche des Kerngitters auf den Schraubbolzen 14 in Längsrichtung einwirkende, einen Grenzwert übersteigende Dehnungskräfte können allenfalls dazu führen, daß der Schraubbolzen 14 am dafür vorgesehenen Dehnungsschaft 23 mit geringerem Durchmesser zwischen dem Gewinde 21 und dem Bolzenkopf 15 reißt, so daß in diesem Fall kein loses Bolzenteil in den spaltförmigen Zwischenraum zwischen den Brennelementkästen gelangt und dort den Steuerstab behindert, da das Gewinde 21 im Eckbolzen 37 verschraubt bleibt, während der Rest des Schraubbolzens 14 einschließlich des Federringes 18 aufgrund der einen Anschlag für den Bolzenkopf 15 bildenden Querstifte 43 bzw. der Aussenkung 22 für den Federring 18 nach wie vor unverlierbar am Winkelteil 2 gehaltert bleiben.When loading and unloading the four nuclear reactor fuel elements into or out of the mesh of the core lattice on the bolt 14 in the longitudinal direction and exceeding a limit value, stretching forces can at most lead to the bolt 14 on the intended expansion shaft 23 having a smaller diameter between the thread 21 and the bolt head 15 tears, so that in this case no loose bolt part gets into the gap-shaped space between the fuel assemblies and there hinders the control rod, since the thread 21 remains screwed in the corner bolt 37, while the rest of the bolt 14 including the The spring washer 18 is still held captive on the angular part 2 due to the transverse pins 43 forming a stop for the bolt head 15 and the depression 22 for the spring washer 18.

Claims (2)

1. Kernreaktorbrennelement mit Brennstäben, die Kernbrennstoff enthalten, die in Durchführungen in einer Kopfplatte geführt sind und von denen zumindest ein Teil in diesen Durchführungen befestigt ist, sowie mit einem Brennelementkasten, in dem die Brennstäbe angeordnet sind, der mit einem innen in einer Ecke an seinem Oberende befindlichen Quersteg auf einem auf der Oberseite der Kopfplatte stehenden Eckbolzen aufliegt und der zusammen mit einem dem Brennelementkasten angepaßten Winkelteil, das außen an zwei Seiten des Brennelementkastens je mit einer sich in Kastenlängsrichtung erstreckenden Blattfeder versehen ist, an diesem Eckbolzen mit einem einen Dehnungsschaft mit verringertem Durchmesser aufweisenden Schraubbolzen festgeschraubt ist, der mittels eines Bolzenkopfes an der Oberseite des Winkelteils und eines Haltekörpers unverlierbar dem Winkelteil zugeordnet ist, dadurch gekenn- zeichnet, daß der Bolzenkopf (15) eine Verengungsstelle (41)aufweist, die durch einen koaxialen Bolzenkopfschaft (42) mit verringertem Durchmesser gebildet ist und die sich in einer Bohrung (13) im Winkelteil (2) zwischen den beiden Enden des Bolzenkopfes befindet, und daß der Haltekörper ein zwischen die beiden Enden des Bolzenkopfes (15) in dessen Verengungsstelle (41) greifender Querstift (43)ist, der in dieser Bohrung (13) am Winkelteil (2) befestigt ist.1. Nuclear reactor fuel element with fuel rods that contain nuclear fuel, which are guided in bushings in a head plate and at least some of which is fastened in these bushings, and with a fuel assembly box, in which the fuel rods are arranged, with one inside in a corner its upper end of the transverse web rests on a corner bolt standing on the upper side of the head plate and, together with an angled part adapted to the fuel assembly box, which is provided on the outside on two sides of the fuel assembly box with a leaf spring extending in the box longitudinal direction, with an expansion shaft on this corner pin screw having a reduced diameter, which is captively assigned to the angle part by means of a bolt head on the upper side of the angle part and a holding body, characterized in that the bolt head (15) has a constriction point (41) which is caused by a coaxial bolt zenkopfschaft (42) is formed with a reduced diameter and which is located in a bore (13) in the angular part (2) between the two ends of the bolt head, and that the holding body between the two ends of the bolt head (15) in the constriction point (41 ) gripping cross pin (43), which is fixed in this bore (13) on the angle part (2). 2. Kernreaktor-Brennelement nach Anspruch 1, dadurch gekennzeichnet,
daß einem zwischen den Bolzenkopf (15) und dem Winkelteil (2) befindlichen Federring (18) eine Aussenkung (22) im Winkelteil (2) zugeordnet ist.2. Nuclear reactor fuel assembly according to claim 1, characterized in that
that a depression (22) in the angle part (2) is associated with a spring ring (18) located between the bolt head (15) and the angle part (2).
EP84113451A 1983-11-21 1984-11-07 Nuclear reactor fuel element Expired EP0142778B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84113451T ATE30281T1 (en) 1983-11-21 1984-11-07 NUCLEAR REACTOR FUEL.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19833341966 DE3341966A1 (en) 1983-11-21 1983-11-21 CORE REACTOR FUEL ELEMENT
DE3341966 1983-11-21

Publications (3)

Publication Number Publication Date
EP0142778A2 true EP0142778A2 (en) 1985-05-29
EP0142778A3 EP0142778A3 (en) 1985-07-17
EP0142778B1 EP0142778B1 (en) 1987-10-14

Family

ID=6214812

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84113451A Expired EP0142778B1 (en) 1983-11-21 1984-11-07 Nuclear reactor fuel element

Country Status (5)

Country Link
US (1) US4861545A (en)
EP (1) EP0142778B1 (en)
JP (1) JPS60133390A (en)
AT (1) ATE30281T1 (en)
DE (2) DE3341966A1 (en)

Cited By (4)

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EP0182196A1 (en) * 1984-11-12 1986-05-28 Ab Asea-Atom Fuel assembly
US4851187A (en) * 1987-02-18 1989-07-25 Siemens Aktiengesellschaft Nuclear reactor fuel assembly
FR2717943A1 (en) * 1994-03-24 1995-09-29 Framatome Sa Replacing nuclear fuel centering pin and replacement pins
WO1996003752A1 (en) * 1994-07-22 1996-02-08 Siemens Aktiengesellschaft Fuel rod assembly put together by means of pegs

Families Citing this family (5)

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Publication number Priority date Publication date Assignee Title
ES2077748T3 (en) * 1991-08-28 1995-12-01 Siemens Ag FUEL ELEMENT FOR NUCLEAR REACTOR WITH SHEET SPRINGS.
US5675621A (en) 1995-08-17 1997-10-07 General Electric Company Reduced height flat spring spacer for nuclear fuel rods
US7463711B1 (en) * 2004-05-25 2008-12-09 Areva Np Inc. Fuel channel fastener
FR2932600B1 (en) * 2008-06-11 2010-06-04 Areva Np LOWER NUCLEAR FUEL ASSEMBLY TIP
US9336910B2 (en) 2010-10-07 2016-05-10 Bwxt Nuclear Energy, Inc. Control rod/control rod drive mechanism couplings

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GB417895A (en) * 1933-10-10 1934-10-15 Frank George Woollard Improvements in screw bolts
FR1406217A (en) * 1963-10-14 1965-07-16 Northrop Corp Captive screw fixing device
GB1179036A (en) * 1966-06-06 1970-01-28 Standard Pressed Steel Co Retained Panel Fastener
FR2202552A5 (en) * 1972-10-10 1974-05-03 Standard Pressed Steel Co
DE2430642A1 (en) * 1973-06-27 1975-03-20 Sangamo Weston SECURITY SEAL DEVICE, IN PARTICULAR FOR USE IN ELECTRIC SUPPLY METERS
US4219386A (en) * 1977-06-10 1980-08-26 Exxon Nuclear Company, Inc. PWR Integral tie plate and locking mechanism
DE2824265A1 (en) * 1978-06-02 1979-12-06 Kraftwerk Union Ag FUEL ELEMENT FOR BOILING WATER NUCLEAR REACTORS

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0182196A1 (en) * 1984-11-12 1986-05-28 Ab Asea-Atom Fuel assembly
US4707328A (en) * 1984-11-12 1987-11-17 Ab Asea-Atom Fuel assembly for a nuclear reactor
US4851187A (en) * 1987-02-18 1989-07-25 Siemens Aktiengesellschaft Nuclear reactor fuel assembly
FR2717943A1 (en) * 1994-03-24 1995-09-29 Framatome Sa Replacing nuclear fuel centering pin and replacement pins
WO1996003752A1 (en) * 1994-07-22 1996-02-08 Siemens Aktiengesellschaft Fuel rod assembly put together by means of pegs
US5787143A (en) * 1994-07-22 1998-07-28 Siemens Aktiengesellchaft Nuclear reactor fuel assembly

Also Published As

Publication number Publication date
EP0142778B1 (en) 1987-10-14
DE3466821D1 (en) 1987-11-19
ATE30281T1 (en) 1987-10-15
US4861545A (en) 1989-08-29
EP0142778A3 (en) 1985-07-17
JPH0412839B2 (en) 1992-03-05
JPS60133390A (en) 1985-07-16
DE3341966A1 (en) 1985-05-30

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